CN101997660A - Method and device for avoiding losing uplink data - Google Patents
Method and device for avoiding losing uplink data Download PDFInfo
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Abstract
The invention discloses a method and a device for avoiding losing uplink data and relates to a long term evolution system. The method comprises the step of: only deleting packet data convergence protocol (PDCP) service data units (SDU) which are determined to be received continuously in PDCP feedback information in a PDCP retransmission cache when a PDCP entity of user equipment (UE) receives the PDCP feedback information in the process of reconstructing a PDCP. The technical scheme of the invention optimizes transmission of the uplink data, particularly avoids losing the data under the condition of continuously reconstructing the PDCP and saves the PDCP cache resources.
Description
Technical field
The present invention relates to long evolving system, relate in particular to method and the device of avoiding upstream data to lose in the long evolving system.
Background technology
LTE is the mobile communcations system project of 3GPP tissue, and this project main performance target comprises: the peak rate that descending 100Mbps, up 50Mbps are provided in the 20MHz spectral bandwidth; Improve the performance of Cell Edge User; Improve cell capacity; Reduce system delay; Support the sub-district of 100km radius to cover; Can provide access service for 350km/h high-speed mobile user greater than 100kbps; Support paired or non-paired frequency spectrum, flexible configuration bandwidth etc.
In order to reach above-mentioned performance objective, the LTE system has adopted the system architecture of simplifying, and its user's veil unit mainly comprises subscriber equipment (UE, User Equipment), enode b (eNB, evolved NodeB) and gateway (S-GW, Serving gateway).ENB is connected by base station-gateway interface S 1 with S-GW, connects by inter-base station interface X2 between the eNB, and UE is connected by wave point Uu with eNB.
Under normal circumstances, the receiving course of downlink data is as follows: S-GW by 1 interface of the S between eNB and the s-GW with PDCP (PDCP) SDU (Service Data Unit, service data unit) submits to eNB, after eNB receives PDCP SDU, through the PDCP entity, form RLC PDU (protocol Data Unit) after the processing of RLC (radio link control) entity, MAC (Media Access Control, FDDI sublayer protocol) form MAC PDU behind the multiplexing RLC PDU of entity, MAC PDU handles the back through physical channel and sends to UE by the Uu mouth.The MAC entity of UE is received the MAC PDU that submits to from physical channel, from MAC PDU, extract logical channel data RLC PDU, RLC PDU reorganization back is formed PDCP PDU, be decrypted behind the PDCP head of PDCP entity removal PDCP PDU, decompress(ion) (for for the data) and integrity verification (for signaling) form PDCP SDU, with the PDCP SDU upper layer entity of submitting to PDCP according to the order of sequence.
Under normal circumstances; the upstream data process of transmitting of UE is as follows: the PDCP entity of UE receives the PDCP SDU of the packet on upper strata as the PDCP entity, forms PDCPPDU after PDCP SDU being compressed (for for the data), integrity protection (for signaling), encrypt and adding the PDCP head.PDCP PDU becomes RLC SDU after submitting to the RLC entity of lower floor, RLC SDU forms RLC PDU after over-segmentation and serial connection, form MAC PDU behind the multiplexing RLC PDU of MAC layer, MAC PDU handles the back through physical channel and sends to eNB by the Uu mouth, eNB adopts opposite process to recover PDCP SDU, and by the S1 interface between eNB and the s-GW PDCP SDU is submitted to S-GW according to the order of sequence.
Switch (handover) and Radio Link Failure reasons such as (RLF, radio link failure) and will interrupt above-mentioned normal up-downgoing process of transmitting.If switching or Radio Link Failure have taken place, for the logic channel that is mapped to affirmation (AM, Acknowledge Mode) pattern, need carry out continuing of up-downgoing data so.Continue in the data of UE side and to finish by PDCP volume reconstruction Rob Roy, will change security context and compressed context because the PDCP volume reconstruction is upright, therefore before the PDCP volume reconstruction stood, the RLC entity was at first rebuild upright.On up direction, the RLC entity transmit leg of UE will abandon all just the RLC SDU in the RLC buffer memory and AMD PDU, and the PDCP entity sends according to upstream data and submits to the RLC entity after the processing that PDCP SDU that situation retransmits needs adopts new security context and compressed context and retransmit; Continue in the data of network side and to finish by the switching of new and old PDCP entity, new and old PDCP entity adopts different security context and compressed context, on up direction, can't be submitted to the RLC SDU and the AMD PDU of PDCP entity for the RLC of lower floor entity, to be dropped, submit to successful PDCPSDU to be submitted to s-GW according to the order of sequence continuously for the RLC of lower floor entity to old PDCP entity, PDCP SDU for discontinuous submission, old PDCP entity has the selection that is transmitted to new PDCP entity, and old PDCP entity is transmitted to new PDCP entity with the reception condition of PDCP SDU.New PDCP entity will receive the upstream data from UE, and send the PDCP status report to UE according to the PDCP state information of old PDCP entity, the PDCP status report mainly comprises two parts content: first sequence number (FMS, First missing SN) and the discontinuous acknowledged sequence number (ACK) lost.The PDCP entity thinks that for the SN that sent the PDCP SDU less than FMS these PDCP SDU are successfully submitted to continuously, and the PDCPSDU for the SN that has sent equals ACK thinks that these PDCP SDU are successfully submitted to by discontinuous.UE upstream data that adjustment is sending according to status report or the upstream data that be about to send: the PDCP SDU that confirms is deleted from buffer memory, cancel these PDCP SDU simultaneously in the transmission of RLC and from the buffer memory of RLC, delete.
As shown in Figure 1, the PDCP entity U on a certain logic channel of UE switches to peer-entities PDCP entity B from peer-entities PDCP entity A, and it is as follows and then to switch to the process of peer-entities PDCP entity C from peer-entities PDCP entity B again.PDCP entity U and PDCP entity A are carried out transmitting uplink data, PDCP entity U sends 1,2,3,4,5, No. 6 PDCP PDU to the PDCP entity A, the PDCP entity A has successfully received 1,4,5, No. 6 PDCP PDU, and the RLC of these PDCP PDU is confirmed to send to the RLC entity of PDCP entity U association.The PDCP entity A sends to the PDCP entity B with the state information of the PDCP PDU of reception, shows successfully to submit No. 1 PDCP PDU to s-GW, and transmits discontinuous PDCP PDU 4,5, No. 6.After PDCP entity U switched to the PDCP entity B, PDCP entity U is No. 1 PDCPPDU of deletion from retransmit buffer memory, and UE will retransmit 2 simultaneously, 3,4,5, No. 6 PDCP PDU gives the PDCP entity B, if UE has received the PDCP status report of PDCP entity B, represents discontinuous 4,5, No. 6 PDCP PDU is forwarded, and the PDCP entity B will abandon instruction and pass to the RLC entity so, to cancel the transmission of 4,5, No. 6 PDCP PDU, simultaneously in the re-transmission buffer memory of PDCP entity, delete 4,5, No. 6 PDCP SDU, when PDCP entity U when the PDCP entity B switches to PDCP entity C, if 4,5, No. 6 PDCP SDU still are discontinuous affirmation, successfully do not receive PDCP PDU No. 3 such as the PDCP entity B, PDCP entity U will delete No. 2 PDCPPDU from retransmit buffer memory so, after switching to PDCP entity C,, retransmit 4 retransmitting in 3,5, No. 6 PDCP SDU.If PDCP entity C has received 4,5, No. 6 PDCP PDU that the PDCP entity B is transmitted, PDCP entity C will come to send confirmation to UE by the PDCP status report so, illustrate that 4,5,6 have received, UE will cancel 4,5,6 transmission once more.
In above-mentioned handoff procedure, the PDCP entity A has transmitted 4,5 to the PDCP entity B when switching first, No. 6 PDCP SDU, and when switching for the second time the PDCP entity B not when PDCP entity C transmits 4,5, No. 6 PDCP SDU, to cause 4,5, No. 6 PDCP SDU lose, and promptly s-GW will can not receive 4,5, No. 6 PDCP SDU.The problem reason is that the PDCP entity A has received discontinuous PDCP SDU from PDCP entity U, and discontinuous PDCP SDU can be transmitted to s-GW by the PDCP entity B, only may be transmitted to PDCP entity C by the PDCP entity B.PDCP entity U deletes according to the PDCP status report and has confirmed the PDCP SDU that successfully receives in the PDCP entity, comprises discontinuous SDU.When PDCP entity U when the PDCP entity B switches to PDCP entity C, if the PDCP entity B is not transmitted discontinuous PDCP SDU, the discontinuous SDU at PDCP entity U place is deleted so, this has caused losing of data.
In addition, in above-mentioned handoff procedure, if the PDCP entity A has not transmitted 4,5 to the PDCP entity B when switching first, No. 6 PDCP SDU, so can not cause losing of data, reason is among the PDCP entity U PDCP status Report that can not receive 4,5, the affirmation of No. 6 PDCP SDU, therefore PDCP entity U can not delete PDCP SDU 4,5, No. 6 from retransmit buffer memory.
In addition, in above-mentioned handoff procedure, if the PDCP entity B guarantees to send 4,5, No. 6 PDCP SDU to PDCP entity C, so can not cause losing of data yet, U has deleted 4,5 even reason is the PDCP entity, No. 6 PDCP SDU, but the PDCP entity B has been transmitted PDCP SDU to PDCP entity C, does not therefore cause losing of data.
What deserves to be mentioned is that 4,5, No. 6 PDCP SDU of above-mentioned example can make a general reference discontinuous PDCPSDU.
PDCP entity A recited above, the scene that continuous switching took place between PDCP entity B and the PDCP entity C is according to the difference of PDCP entity network element position of living in, contingent scene comprises: (1) eNB inscribe is striden the situation that eNB switches again after changing and giving birth to, and causes that the inner reason of switching of eNB may be a Radio Link Failure.Because when switching in the eNB, the data of transmitting are carried out in eNB inside for the first time, be that PDCP entity A and PDCP entity B are positioned at first eNB, therefore the possibility of transmitting discrete date is bigger, and when switching to the PDCP entity C that is positioned at other eNB, eNB determines whether transmitting discontinuous packet according to network condition.(2) intra-RAT switches back generation inter-RAT switching, PDCP entity A and PDCP entity B are used same RAT, when switching for the second time, the network condition complexity, PDCP entity C uses different RAT, and the forwarding of packet may bring very big time delay, therefore may the PDCP entity B will consider the forwarding of not carrying out packet, eat dishes without rice or wine and will be responsible for carrying out the repeating transmission of packet this moment, and this has brought reliability and low time delay.
Summary of the invention
Technical problem to be solved by this invention is a kind of method and device of avoiding upstream data to lose to be provided, thereby in continuous P DCP reconstruction immediately, to avoid losing of upstream data.
In order to address the above problem, to the invention discloses a kind of method of avoiding upstream data to lose and comprise:
Rebuild in the upright process at PDCP, when the PDCP entity of UE is received the PDCP feedback information, in PDCP re-transmission buffer memory, only delete the PDCP SDU that affirmation is received continuously in the PDCP feedback information.
Further, in the said method, when described PDCP feedback information was the PDCP status report, the PDCP entity of described UE read the first sequence number (FMS) of losing in the described status report, retransmitted in the buffer memory at described PDCP and only deleted the PDCP SDU of sequence number less than described FMS.
Further, the PDCP entity of described UE keeps and does not connect the PDCP SDU that acknowledged sequence number (ACK) is confirmed in the described PDCP status report, deletes the corresponding PDCP PDU of PDCP SDU that is confirmed with described ACK in lower floor's radio link control (RLC) entity of described UE simultaneously.
Further, in the said method, during PDCP PDU that the continuous success that the RLC of lower floor entity that described PDCP feedback information is described UE is confirmed is received, the PDCP entity of described UE retransmits in the buffer memory the corresponding PDCP SDU of PDCP PDU that only deletion and the continuous success of described RLC entity affirmation are received at described PDCP.
Wherein, when the discontinuous PDCP PDU that receives that the PDCP of described UE entity receives that the RLC of lower floor entity confirms, retransmit the PDCPSDU that keeps described PDCP PDU correspondence in the buffer memory at described PDCP.
The PDCP entity of described UE retransmits the position indication that the PDU that submits to the RLC of lower floor entity is set in the buffer memory at PDCP, one side of indicating in this position is the PDCP PDU that the PDCP entity of described UE had been submitted to lower floor's RLC entity, and the opposite side of this position indication is the PDCP PDU that the PDCP entity of described UE is not submitted to the RLC of lower floor entity.
The invention also discloses a kind of method of avoiding upstream data to lose, comprising:
After the one PDCP entity of network side sends to the PDCP entity of UE with the PDCP status report, if the PDCP entity of described UE switches to the 2nd PDCP entity of network side, a then described PDCP entity is transmitted the PDCPSDU that ACK confirmed in the described PDCP status report to described the 2nd PDCP entity.
Further, in the said method, after the PDCP entity of described UE is received the PDCP status report of described PDCP entity transmission, from PDCP re-transmission buffer memory, delete the PDCP service data unit (SDU) of sequence number less than FMS in the described PDCP status report, and the PDCP SDU that ACK confirmed in the described PDCP status report.
The invention also discloses a kind of device of avoiding upstream data to lose, comprise that PDCP entity and PDCP retransmit buffer memory, wherein:
Described PDCP entity is used for receiving the PDCP feedback information in the upright process of PDCP reconstruction, and retransmits the PDCPSDU that affirmation is received continuously in the deletion PDCP feedback information the buffer memory from described PDCP;
Described PDCP retransmits buffer memory, is used to preserve the PDCP SDU that PDCP retransmits.
Further, in the said apparatus, when described PDCP feedback information is the PDCP status report, described PDCP entity reads FMS and ACK in the described status report, the deletion sequence number is less than the PDCP SDU of described FMS from described PDCP re-transmission buffer memory, keep the PDCP SDU that described ACK confirms, delete the corresponding PDCP PDU of PDCP SDU that is confirmed with described ACK in the RLC of the lower floor entity of described UE simultaneously.
Further, in the said apparatus, during PDCP PDU that the continuous success that the RLC of lower floor entity that described PDCP feedback information is described UE is confirmed is received, the PDCP entity of described UE retransmits in the buffer memory the corresponding PDCP SDU of PDCP PDU that only deletion and the continuous success of described RLC entity affirmation are received at described PDCP.
The invention also discloses a kind of device of avoiding upstream data to lose, comprise PDCP status report generation module and PDCP processing module, wherein:
Described PDCP status report generation module is used for generating the PDCP status report according to the state of the upstream data that is received, and described PDCP status report is sent to the PDCP entity of UE;
Described PDCP processing module, when the PDCP of described UE entity generated the PDCP switching, the PDCPSDU that ACK confirmed in the PDCP status report with described PDCP status report generation module generation sent to the target P DCP entity after the switching.
Technical solution of the present invention has been optimized the transmission of upstream data, is particularly taking place to have avoided the situation of loss of data under the upright situation of continuous P DCP reconstruction, and is saving the PDCP cache resources.
Description of drawings
Fig. 1 sends schematic diagram for the PDCP entity that subscriber equipment in the prior art is used for the AM pattern;
Fig. 2 is the device schematic diagram that sends upstream data in the present embodiment;
Fig. 3 is the schematic diagram that PDCP retransmits buffer memory in the device shown in Figure 2;
Fig. 4 is the flow chart that device shown in Figure 2 sends upstream data;
Fig. 5 is the flow chart of scene 1 in the present embodiment;
Fig. 6 is the flow chart of scene 2 in the present embodiment;
Fig. 7 is the flow chart of scene 3 in the present embodiment;
The flow chart of Fig. 8 for avoiding upstream data to lose by network equipment in the present embodiment.
Embodiment
To the effect that of the present invention, when UE is carrying out upstream data when sending, after the upper layer entity of PDCP is submitted to the PDCP entity with packet, the PDCP entity is buffered in PDCP with this PDCP SDU and retransmits in the buffer memory, and be that this PDCP SDU starts a discard_timer, when discard_timer expires, PDCP SDU will delete from retransmit buffer memory automatically, according to submitting the principle that starts discard-timer earlier earlier to, generally speaking, the PDCP SDU that submits to earlier will be deleted prior to the PDCP SDU that submit to the back.
Wherein, for the RLC entity of UE is indicated the PDCPPDU that successfully sends to the PDCP of UE entity for, if the PDCP PDU that indication PDCP entity successfully sends is continuous, the PDCP entity of UE will be deleted the pairing PDCP SDU of these continuous PDCP PDU from buffer memory so, if the PDCP PDU that the PDCP entity successfully sends is discontinuous, the PDCP entity of UE will keep the pairing PDCP SDU of these discrete PDCP PDU in buffer memory so;
The PDCP status report middle finger of receiving for the PDCP entity of UE is shown as the PDCPPDU that merit sends, if it is continuous indicating the PDCP PDU that successfully sends, the PDCP entity of UE will be deleted the pairing PDCP SDU of these continuous PDCP PDU from buffer memory so, and the corresponding PDCP PDU of RLC entity deletion of the PDCP entity of UE indication UE, the RLC entity of the UE of the PDCP entity of UE indication is simultaneously cancelled this PDCP PDU of current transmission; If it is discontinuous indicating the PDCPPDU that successfully sends, the PDCP entity of UE will keep the pairing PDCP SDU of these disconnected PDCPPDU in buffer memory so, and the corresponding PDCP PDU of RLC entity deletion of the PDCP entity of UE indication UE cancels the transmission of current this PDCP PDU simultaneously.
Below in conjunction with drawings and the specific embodiments technical solution of the present invention is described further.
A kind of device of avoiding upstream data to lose, i.e. UE, its structure comprises that PDCP entity, the RLC of lower floor entity and PDCP retransmit cache module as shown in Figure 2.The each several part function introduction is as follows.
The PDCP entity is used to receive the PDCP feedback information, and retransmits buffer memory according to the PDCP in these information real-time update PDCP re-transmission cache module, and wherein, the PDCP feedback information is the PDCP PDU that the continuous success of PDCP status report, the affirmation of the RLC of lower floor entity is received;
In the present embodiment, the PDCP entity retransmits at PDCP and is provided with the RLC of lower floor entity submission position indication in the cache module and sends the indication of successful position, it is the PDCP SDU that submits to the RLC of lower floor entity that the RLC of lower floor entity is submitted a side of position indication to, and opposite side is the PDCP SDU that does not submit to the RLC of lower floor entity; A side that sends the indication of successful position is the PDCP SDU that success continuously sends, and opposite side is the not successful continuously PDCP SDU that sends;
When the PDCP feedback information of receiving as PDCP is the PDCP status report, the sequence number of being preserved in the deletion PDCP re-transmission cache module is less than PDCP SDU or the PDCP PDU (be about to send the indication of successful position and move to the PDCP SDU that FMS confirms) of FMS in the PDCP status report, and ACK confirmed in the reservation PDCP status report PDCP SDU or PDCP PDU; The PDCP feedback information of receiving as UE be continuous success that RLC confirms receive PDCP PDU the time, deletion PDCP retransmits these PDCP PDU in the cache module, and corresponding PDCP SDU (be about to send the indication of successful position and move to the PDCP SDU that the RLC entity is confirmed); When the discontinuous PDCP PDU that receives that the PDCP entity receives that the RLC of lower floor entity confirms, keep PDCP and retransmit these PDCP PDU in the cache module, and corresponding PDCP SDU.
The PDCP entity also in retransmitting buffer memory record to the RLC of lower floor submitted but be not identified the PDCP SDU state of the PDCP PDU that continuous success sends (promptly submit the position indication to and send PDCP PDU between the indication of successful position) correspondence at the RLC of lower floor entity: promptly be identified reception or be not identified reception.
The RLC entity is used for the PDCP PDU that receives to the continuous success that the PDCP entity send to be confirmed and the discontinuous PDCP PDU that receives of affirmation;
PDCP retransmits cache module, is used to store the described PDCP SDU that will retransmit;
In the present embodiment, PDCP retransmits cache module and carries out buffer memory according to structure shown in Figure 3, wherein,
The discontinuous PDCP SDU that receives that expression PDCP status report or RLC are confirmed.
Introduce above-mentioned UE earlier after generation PDCP reconstruction is upright, send the whole process of upstream data, as shown in Figure 4, may further comprise the steps:
When the PDCP entity of step 400:UE is received the PDCP feedback information, carry out the renewal that PDCP retransmits buffer memory;
In this step, the PDCP feedback information is the PDCP PDU that the continuous success of PDCP status report or the RLC of lower floor affirmation is received, when UE receives the PDCP status report, then retransmit buffer memory and only delete PDCP SDU or the PDCP PDU of sequence number, and keep ACK confirmed in the PDCP status report PDCP SDU or PDCP PDU less than FMS the PDCP status report from PDCP;
When UE receives the PDCP PDU that continuous success that RLC confirms receives, then retransmit these PDCP PDU of deletion the buffer memory from PDCP, and corresponding PDCP SDU.
Step 401: after the PDCP of UE entity U switched, the target P DCP entity of the PDCP entity U of UE after switching sent or retransmits current PDCP and retransmit all PDCPSDU or PDCP PDU in the buffer memory.
UE take place PDCP rebuild upright after, according to the transmission of upstream data with receive the difference of the order of PDCP status report, can be divided into three scenes, in different scenes, the PDCP entity U of UE needs different processing.
Below just in conjunction with these three scenes, specifically introduce the processing procedure of UE, thereby avoid losing of upstream data.
After the PDCP entity U of UE received the PDCP status report of target P DCP entity transmission, upstream data also sent, and UE needs to apply for to eNB earlier the process of the interface-free resources of upstream data, as shown in Figure 5, may further comprise the steps:
After PDCP entity U on a certain logic channel of step 500:UE switches to the PDCP entity B from the PDCP entity A, target P DCP entity PDCP entity B is before giving PDCP entity U distribution ascending resource, send the PDCP status report to PDCP entity U, status report reflection PDCP entity A is to the affirmation information of the up PDCP SDU of PDCP entity B transmission;
The PDCP entity U of step 510:UE receives the PDCP status report that the PDCP entity B sends, and retransmits caching according to the affirmation information in the PDCP status report;
Particularly, for the PDCP SDU that confirms continuously in the PDCP status report, the PDCP entity U of UE will retransmit PDCP SDU that deletion is confirmed continuously the buffer memory and the PDCP PDU that is associated from PDCP, simultaneously, the PDCP entity U of UE also will send the indication of successful position and move forward, retransmit the position of first unacknowledged PDCP SDU in the buffer memory with expression PDCP, and the PDCP SDU of discontinuous affirmation will be retained in the PDCP of the PDCP entity U of UE and retransmit in the buffer memory.
The PDCP entity U of step 520:UE goes up the row cache report with the interface-free resources to PDCP entity B application upstream data according to the content calculating that PDCP retransmits in the buffer memory, and the PDCP entity B is received the resource of application back for UE distribution upstream data;
In this step, UE retransmits the size that sends all PDCPSDU (perhaps PDCP PDU) that indicated successful position in the buffer memory according to PDCP and calculates upward row cache report, wherein, send the PDCP SDU that all PDCP SDU that indicated successful position comprise the RLC entity of not submitting to UE, and submitted to the RLC of lower floor but never confirmed to send the PDCP SDU that first PDCP SDU successfully rises, but except the PDCP SDU of the PDCP status report affirmation that is sent by the PDCP entity B by RLC entity or PDCP status report.
The PDCP entity U of step 530:UE retransmits PDCP in the buffer memory and sends all the PDCP SDU (perhaps PDCP PDU) that indicates successful position and use the RLC entity of submitting to behind new compressed context and the new security context formation PDPC SDU to send, but except the PDCP SDU of the PDCP status report affirmation that is sent by the PDCP entity B;
Step 540: after the PDCP of UE entity U switches to PDCP entity C from the PDCP entity B, the PDCP entity U of UE sends or retransmits current PDCP to PDCP entity C and retransmits and send all PDCP SDU (perhaps PDCP PDU) that indicate successful position in the buffer memory, but by except the PDCP SDU of the PDCP status report affirmation of PDCP entity C transmission.
After the PDCP entity U of UE receives the PDCP status report of target P DCP entity transmission, upstream data is sending and is not sending successfully, UE indicates the process that sends to the RLC entity with the abandoning of PDCP PDU that the PDCP status report is confirmed, as shown in Figure 6, may further comprise the steps:
After PDCP entity U on a certain logic channel of step 600:UE switches to the PDCP entity B from the PDCP entity A, to target P DCP entity B application interface-free resources;
The PDCP entity U of step 610:UE goes up the row cache report with the interface-free resources to PDCP entity B application upstream data according to the content calculating that current PDCP retransmits in the buffer memory, and the PDCP entity B is received the resource of application back for UE distribution upstream data;
In this step, during the PDCP entity application ascending resource of UE, retransmit the size that sends all the PDCP SDU (perhaps PDCP PDU) that indicated successful position in the buffer memory according to PDCP and calculate upward row cache report, wherein, send the PDCP SDU that all PDCP SDU that indicated successful position comprise the RLC entity of not submitting to UE, and submitted to the RLC of lower floor but never confirmed to send the PDCP SDU that first PDCP SDU successfully rises by RLC entity or PDCP status report.
After the PDCP entity of step 620:UE receives the distribution of ascending resource, to not submit to the PDCP SDU or the PDU of RLC entity, and submit to the RLC entity but all PDCP PDU that first PDCP SDU of being confirmed continuously as yet rises send to the PDCP entity B;
The PDCP entity of step 630:UE is at the process of transmitting of step 610, receive the PDCP status report, for the continuous P DCP PDU that confirms in the PDCP status report, the PDCP entity U of UE will abandon the PDCP SDU in PDCP re-transmission buffer memory and the corresponding PDCP PDU of this PDCP PDU correspondence, all continuous or discontinuous PDCPPDU for confirming in the PDCP status report abandon indication to the RLC of lower floor entity with transmission;
After the PDCP entity U of step 640:UE switches to PDCP entity C from the PDCP entity B, the PDCP entity U of UE sends or retransmits current PDCP to PDCP entity C and retransmits and send all PDCP SDU (perhaps PDCP PDU) that indicate successful position in the buffer memory, but by except the PDCP SDU of the PDCP status report affirmation of PDCP entity C transmission.
After UE received the PDCP status report of target P DCP entity transmission, uplink data sending as shown in Figure 7, may further comprise the steps by the process that successfully sends and confirm:
After the PDCP entity U of step 700:UE switched to the PDCP entity B from the PDCP entity A, target P DCP entity B successfully received all PDCP upstream datas, sent the PDCP status report to the PDCP of UE entity afterwards;
The PDCP entity of step 710:UE will then retransmit buffer memory to PDCP and not carry out any operation according to confirming in the receiving PDCP status report that all PDCP upstream datas send successfully;
After the PDCP entity U of step 720:UE switches to PDCP entity C from the PDCP entity B, the PDCP entity U of UE sends or retransmits current PDCP to PDCP entity C and retransmits and send all PDCP SDU (perhaps PDCP PDU) that indicate successful position in the buffer memory, but by except the PDCP SDU of the PDCP status report affirmation of PDCP entity C transmission.
In addition, can also be in the improvement of network side to carry out the transmission of upstream data, be after the PDCP entity B of network side sends to the reciprocity PDCP entity U of UE side with the PDCP status report, if PDCP entity U switches to the PDCP entity C of network side once more, then the PDCP entity B will be transmitted the discontinuous PDCP SDU that is confirmed in the above-mentioned PDCP status report to PDCP entity C, like this, just can avoid losing of upstream data.
The network equipment of a kind of PDCP of comprising status report generation module and PDCP processing module can be proposed particularly, in the present embodiment.Wherein:
PDCP status report generation module is used for generating the PDCP status report according to the state of the upstream data that is received, and described PDCP status report is sent to the PDCP entity of UE;
The PDCP processing module, when the PDCP of UE entity generated the PDCP switching, the PDCP SDU that ACK confirmed in the PDCP status report with the generation of PDCP status report generation module sent to the target P DCP entity after the switching.
The operation principle of above-mentioned network equipment is, write down the discontinuous PDCP SDU that is confirmed in each PDCP status report, when the PDCP of UE entity generates the PDCP switching, the moment of the target P DCP entity C forwarding state report after switching, obtain the continuous reception condition of these PDCP SDU, only PDCP SDU and the status report with discontinuous reception is transmitted to PDCP entity C together, and UE is after receiving the PDCP status report, to from retransmit buffer memory, delete the continuous and discontinuous PDCP SDU that all PDCP status reports are confirmed, and cancel the transmission of these data.
Detailed process such as Fig. 8 may further comprise the steps:
After step 800:PDCP entity A was transmitted the packet of PDCP state information and state information indication to the PDCP entity B, the PDCP entity B sent the PDCP status report to the PDCP of UE entity U;
The PDCP entity U of step 810:UE will confirm to send successful PDCP PDU by deletion PDCP status report from retransmit buffer memory, wherein, the PDCP PDU of deletion comprises the PDCP PDU of reception continuously and the PDCP PDU of discontinuous reception;
After the PDCP entity U of step 820:UE switched to PDCP entity C from the PDCP entity B, the PDCP entity U of UE retransmitted all PDCP SDU that the PDCP SDU that do not obtain not being identified the PDCP status report that PDCP SDU that the RLC of lower floor confirms and target P DCP entity C send before switching from first begins to PDCP entity C;
Step 830:PDCP entity B is only transmitted the discontinuous PDCPSDU that successfully receives to PDCP entity C, and the successful continuous P DCP SDU that receives is submitted to gateway.
The network equipment that alleged PDCP entity A, PDCP entity B and PDCP entity C all belongs to present embodiment and proposed in the above-mentioned flow process.
From the foregoing description as can be seen, when technical solution of the present invention sends upstream data at subscriber equipment, the discontinuous PDCP SDU that the PDCP status report is confirmed is retained in the re-transmission buffer memory of PDCP entity, thereby the upstream data of having avoided continuous switching to cause is lost problem; The continuous PDCP SDU that is confirmed by RLC affirmation or PDCP status Report then is not retained in the re-transmission buffer memory of PDCP entity, thereby has saved the PDCP cache resources.
Certainly; the present invention also can have numerous embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes or variation according to the present invention; in every case any modification of being done within the spirit and principles in the present invention, be equal to replacements, improvement, all should be included within the protection range of the appended claim of the present invention.
Claims (12)
1. a method of avoiding upstream data to lose is characterized in that, this method comprises:
Rebuild in the upright process at PDCP (PDCP), when the PDCP entity of subscriber equipment (UE) is received the PDCP feedback information, in PDCP re-transmission buffer memory, only delete the PDCP service data unit (SDU) that affirmation is received continuously in the PDCP feedback information.
2. the method for claim 1 is characterized in that,
When described PDCP feedback information was the PDCP status report, the PDCP entity of described UE read the first sequence number (FMS) of losing in the described status report, retransmitted in the buffer memory at described PDCP and only deleted the PDCP SDU of sequence number less than described FMS.
3. method as claimed in claim 2 is characterized in that,
The PDCP entity of described UE keeps and does not connect the PDCP SDU that acknowledged sequence number (ACK) is confirmed in the described PDCP status report, deletes the corresponding PDCP PDU of PDCP SDU that is confirmed with described ACK in lower floor's radio link control (RLC) entity of described UE simultaneously.
4. the method for claim 1 is characterized in that,
During PDCP protocol Data Unit (PDU) that the continuous success that the RLC of lower floor entity that described PDCP feedback information is described UE is confirmed is received, the PDCP entity of described UE retransmits in the buffer memory the corresponding PDCP SDU of PDCP PDU that only deletion and the continuous success of described RLC entity affirmation are received at described PDCP.
5. method as claimed in claim 4 is characterized in that,
When the discontinuous PDCPPDU that receives that the PDCP of described UE entity receives that the RLC of lower floor entity confirms, retransmit the PDCP SDU that keeps described PDCP PDU correspondence in the buffer memory at described PDCP.
6. as each described method of claim 1 to 5, it is characterized in that,
The PDCP entity of described UE retransmits the position indication that the PDU that submits to the RLC of lower floor entity is set in the buffer memory at PDCP, one side of indicating in this position is the PDCP PDU that the PDCP entity of described UE had been submitted to lower floor's RLC entity, and the opposite side of this position indication is the PDCP PDU that the PDCP entity of described UE is not submitted to the RLC of lower floor entity.
7. a method of avoiding upstream data to lose is characterized in that, this method comprises:
After first PDCP (PDCP) entity of network side sends to the PDCP entity of subscriber equipment (UE) with the PDCP status report, if the PDCP entity of described UE switches to the 2nd PDCP entity of network side, a then described PDCP entity is transmitted to described the 2nd PDCP entity and is not connected the PDCP SDU that acknowledged sequence number (ACK) is confirmed in the described PDCP status report.
8. method as claimed in claim 7 is characterized in that,
After the PDCP entity of described UE is received the PDCP status report of described PDCP entity transmission, from PDCP re-transmission buffer memory, delete sequence number less than the first PDCP service data unit (SDU) of losing sequence number (FMS) in the described PDCP status report, and the PDCP SDU that ACK confirmed in the described PDCP status report.
9. a device of avoiding upstream data to lose is characterized in that, this device comprises that PDCP (PDCP) entity and PDCP retransmit buffer memory, wherein:
Described PDCP entity is used for receiving the PDCP feedback information in the upright process of PDCP reconstruction, and retransmits the PDCP service data unit (SDU) that affirmation is received continuously in the deletion PDCP feedback information the buffer memory from described PDCP;
Described PDCP retransmits buffer memory, is used to preserve the PDCP SDU that PDCP retransmits.
10. device as claimed in claim 9 is characterized in that,
When described PDCP feedback information is the PDCP status report, described PDCP entity reads firstly in the described status report to be lost sequence number (FMS) and is not connected acknowledged sequence number (ACK), the deletion sequence number is less than the PDCP SDU of described FMS from described PDCP re-transmission buffer memory, keep the PDCP SDU that described ACK confirms, delete the corresponding PDCP PDU of PDCP SDU that is confirmed with described ACK in lower floor's radio link control (RLC) entity of described UE simultaneously.
11. device as claimed in claim 9 is characterized in that,
During PDCP protocol Data Unit (PDU) that the continuous success that the RLC of lower floor entity that described PDCP feedback information is described UE is confirmed is received, the PDCP entity of described UE retransmits in the buffer memory the corresponding PDCP SDU of PDCP PDU that only deletion and the continuous success of described RLC entity affirmation are received at described PDCP.
12. a device of avoiding upstream data to lose is characterized in that, this device comprises PDCP (PDCP) status report generation module and PDCP processing module, wherein:
Described PDCP status report generation module is used for generating the PDCP status report according to the state of the upstream data that is received, and described PDCP status report is sent to the PDCP entity of subscriber equipment (UE);
Described PDCP processing module, when the PDCP of described UE entity generates PDCP and switches, do not connect the target P DCP entity after PDCP SDU that acknowledged sequence number (ACK) confirmed sends to switching in the PDCP status report that described PDCP status report generation module is generated.
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